PS:
QuoteVilros PSU with on/off
You're not an IT guy, so you probably don't know that switching off by PSU can destroy your file system.
The Argon ONE case has a power button. Do you use this button to shutdown? If you don't, here are your instructions to use it on LE.
If you did the bad power-off by PSU switch, then you don't need to buy a new microSD. Reformat it and do a fresh LE installation. That should fix a broken file system.